linux-kernel - [patch] irda: fix !PNP support in drivers/net/irda/nsc-ircc.c

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Date:	Sat, 3 May 2008 21:32:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org
Cc:	samuel@...tiz.org, Dmitry Torokhov <dtor_core@...ritech.net>
Subject: [patch] irda: fix !PNP support in drivers/net/irda/nsc-ircc.c


x86.git testing found the following build failure in latest -git:

 drivers/built-in.o: In function `nsc_ircc_pnp_probe':
 nsc-ircc.c:(.text+0xdf1b6): undefined reference to `pnp_get_resource'
 nsc-ircc.c:(.text+0xdf1d4): undefined reference to `pnp_get_resource'
 nsc-ircc.c:(.text+0xdf1ee): undefined reference to `pnp_get_resource'
 nsc-ircc.c:(.text+0xdf237): undefined reference to `pnp_get_resource'
 nsc-ircc.c:(.text+0xdf24c): undefined reference to `pnp_get_resource'
 drivers/built-in.o:nsc-ircc.c:(.text+0xdf266): more undefined references to `pnp_get_resource' follow
 make: *** [.tmp_vmlinux1] Error 1

triggered via this config:

  http://redhat.com/~mingo/misc/config-Sat_May__3_20_53_13_CEST_2008.bad

while generally most users will have PNP enabled, drivers can support
non-PNP build mode too - and most drivers implement it. That is typically
done by providing a dummy pnp_driver structure that will not probe anything.

The fallback routines in the driver will handle this dumber mode of
operation too.

This patch implements that. I have not tested whether this actually
works on real hardware so take care. It does resolve the build bug.

[ Another solution that is used by a few drivers is to exclude the driver
  in the Kconfig if PNP is disabled, via "depends on PNP", but this would
  limit the availability of the driver needlessly. ]

Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 drivers/net/irda/nsc-ircc.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux/drivers/net/irda/nsc-ircc.c
===================================================================
--- linux.orig/drivers/net/irda/nsc-ircc.c
+++ linux/drivers/net/irda/nsc-ircc.c
@@ -100,7 +100,9 @@ static int nsc_ircc_probe_39x(nsc_chip_t
 static int nsc_ircc_init_108(nsc_chip_t *chip, chipio_t *info);
 static int nsc_ircc_init_338(nsc_chip_t *chip, chipio_t *info);
 static int nsc_ircc_init_39x(nsc_chip_t *chip, chipio_t *info);
+#ifdef CONFIG_PNP
 static int nsc_ircc_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *id);
+#endif
 
 /* These are the known NSC chips */
 static nsc_chip_t chips[] = {
@@ -156,9 +158,11 @@ static const struct pnp_device_id nsc_ir
 MODULE_DEVICE_TABLE(pnp, nsc_ircc_pnp_table);
 
 static struct pnp_driver nsc_ircc_pnp_driver = {
+#ifdef CONFIG_PNP
 	.name = "nsc-ircc",
 	.id_table = nsc_ircc_pnp_table,
 	.probe = nsc_ircc_pnp_probe,
+#endif
 };
 
 /* Some prototypes */
@@ -916,6 +920,7 @@ static int nsc_ircc_probe_39x(nsc_chip_t
 	return 0;
 }
 
+#ifdef CONFIG_PNP
 /* PNP probing */
 static int nsc_ircc_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *id)
 {
@@ -952,6 +957,7 @@ static int nsc_ircc_pnp_probe(struct pnp
 
 	return 0;
 }
+#endif
 
 /*
  * Function nsc_ircc_setup (info)
--
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